Squeeze the banana to log into this office Wi-Fi • The Register

In some offices, you have to ask around for the Wi-Fi password, or find it written down on a bit of paper. In others, you do it by poking a banana.

Danish network engineer Stefan Milo constructed his fruity authentication system by wiring a piece of fruit to a Makey Makey board and a Raspberry Pi mounted on acrylic glass. The entire setup cost under $100, and creates a novel way for guests to obtain one-time access codes.